# Create and Modify Reference Lines
## Creating a New Reference Line
### Step 1 - Start Reference Line Insertion
Begin insertion by clicking the `+ Create` button, right-clicking in empty space, or using the `Ctrl + Q`keyboard shortcut and selecting `Reference Line` .
{% hint style="success" %}
**Tip**
You can use the keyboard shortcut `Ctrl + Q + R` to begin inserting a reference line.
{% endhint %}
### Step 2A - Define the Line
Depending on the desired line type (see more details below), click an existing line or intersection to determine the first selection. Once selected, move your mouse to the desired location or intersection and click again to insert the reference line.
### Step 2B - Define Multiple Lines
Select a line to define the start for your run of lines. Once this has been selected, use the `+` and `-` keys to update the quantity or enter it manually in the floating quantity dialog. Select a second line to define the end of your run.
{% hint style="info" %}
**Note:** This is currently only supported with Division Lines.
{% endhint %}
## Creating Specific Line Types
### Point-to-Point Line
`Point-to-Point` lines are created by clicking two intersections.
### Point-Slope Line
`Point-Slope` lines are created by clicking an intersection and clicking again to set the angle.
### Parallel Line
`Parallel` lines are created by clicking a line and clicking again at the desired offset.
### Perpendicular Line
`Perpendicular` lines are created by clicking a line followed by an intersection.
### Division Line
`Division` lines are created by clicking a line followed by another line.
## Deleting Reference Lines
### Step 1 - Select a Reference Line
Select the line by clicking on it in the scene. Alternatively, you can select a reference line from the `Collections Subpanel` .
### Step 2 - Delete the Line
Once selected, you can simply hit the `Delete` key. If you are using the `Collections Subpanel` and have selected the reference line, you can click `Delete Selected Item(s)`.
## Delete Unused Reference Lines
### Step 1 - Open the Right Sidebar
If the `Right Sidebar` is not open, click the `Toggle Right Sidebar` arrow button to expand the panel.
### Step 2 - Delete Unused Reference Lines
Open the reference lines menu by clicking Menu  next to `Reference Lines` in the `Collections Subpanel`. Click `Delete Unused Reference Lines`.
## Modifying Reference Line Properties
### Step 1 - Select a Reference Line
Select the line by clicking on it in the scene. Alternatively, you can use the `Right Sidebar` to select a reference line.
### Step 2 - Open the Right Sidebar
If the `Right Sidebar` is not open, click the `Toggle Right Sidebar` arrow button to expand the panel.
### Step 3 - Use the Properties Panel to Make Modifications
Navigate to the `Properties Panel` in the `Right Sidebar` to make modifications to the selected reference line. Depending on the type of line selected, there will be tools that allow you to modify the `Base Point`, `End Point`, `Intersection`, `Offset` and `Line Direction`.
{% hint style="danger" %}
**Warning**
Modifying a reference line that other objects and their reference lines depend on can have unintended consequences, especially when changing fundamental properties like the Line Type.
{% endhint %}
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